[H-CG22] Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Status, operations, and scientific application

[HCG22-P03] Vertical profiles of radionuclides in soil at the site of the remains of Nagasaki Medical College

*Satoshi Fukutani¹, Hiroshi YASHIMA¹, Tadashi MUKAI¹, Tomonori ADACHI^1,2, Satoru ENDO³, Naoko FUKUDA⁴, Sumi YOKOYAMA⁴, Jun INOUE⁵, Koichi TAKAMIYA¹, Maiko IKEGAMI¹, Yasuhito IGARASHI¹ (1. Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2.ATOX Co., Ltd., 3.Hiroshima University, 4.Nagasaki University, 5.Osaka Metropolitan University)

Keywords:Soil profile survey, Nagasaki Atomic-bomb, Remains, Radionuclides

[Introduction] In 2023, the remains of former Nagasaki Medical School were excavated at the Sakamoto Campus of Nagasaki University. It is believed that almost all buildings of the former Nagasaki Medical College were destroyed and went up in flames when the atomic bomb exploded on Nagasaki in 1945. This investigation was conducted in the belief that traces of the atomic bombing remained not only on the buildings but also in the soil.
[Methods] Soil samples were collected at 12 depth points using soil sections exposed during excavation of the site. Cs-137, Pb-210, and uranium were measured from these samples and their depth profiles were obtained. The results of the analysis will be discussed in the presentation.